A generalized form of the extraction constant for the partition of a metal chelate between immiscible aqueous and organic phases |
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Authors: | HMNH Irving Jean Wyrley-Birch |
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Institution: | Department of Analytical Science, University of Cape Town, Rondebosch 7700 South Africa |
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Abstract: | The theory underlying the partition of sparingly soluble reagents and their formally neutral metal chelates between an aqueous phase and any immisicible organic phase leads to a generalized extraction constant K*ex=KexSnr,0/Sc,o where Kex is the conventional extraction constant and Sr,oSc,o are the molar solubilities of reagent and metal complex, respectively, in the same organic solvent. The predicted constancy of K*ex is confirmed for measurements in seven solvents and for systems involving mono-, di- and tridithizonates of Ag+, Zn2+ and Bi3+, respectively. |
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